1 /*- 2 * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are met: 6 * 7 * a) Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * 10 * b) Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the distribution. 13 * 14 * c) Neither the name of Cisco Systems, Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived 16 * from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 20 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 28 * THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 32 /* $KAME: sctp_peeloff.c,v 1.13 2005/03/06 16:04:18 itojun Exp $ */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 #include <netinet/sctp_os.h> 37 #include <netinet/sctp_pcb.h> 38 #include <netinet/sctputil.h> 39 #include <netinet/sctp_var.h> 40 #include <netinet/sctp_var.h> 41 #include <netinet/sctp_sysctl.h> 42 #include <netinet/sctp.h> 43 #include <netinet/sctp_uio.h> 44 #include <netinet/sctp_peeloff.h> 45 #include <netinet/sctputil.h> 46 #include <netinet/sctp_auth.h> 47 48 49 int 50 sctp_can_peel_off(struct socket *head, sctp_assoc_t assoc_id) 51 { 52 struct sctp_inpcb *inp; 53 struct sctp_tcb *stcb; 54 uint32_t state; 55 56 inp = (struct sctp_inpcb *)head->so_pcb; 57 if (inp == NULL) { 58 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 59 return (EFAULT); 60 } 61 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 62 if (stcb == NULL) { 63 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOENT); 64 return (ENOENT); 65 } 66 state = SCTP_GET_STATE((&stcb->asoc)); 67 if ((state == SCTP_STATE_EMPTY) || 68 (state == SCTP_STATE_INUSE) || 69 (state == SCTP_STATE_COOKIE_WAIT) || 70 (state == SCTP_STATE_COOKIE_ECHOED)) { 71 SCTP_TCB_UNLOCK(stcb); 72 SCTP_LTRACE_ERR_RET(inp, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 73 return (ENOTCONN); 74 } 75 SCTP_TCB_UNLOCK(stcb); 76 /* We are clear to peel this one off */ 77 return (0); 78 } 79 80 int 81 sctp_do_peeloff(struct socket *head, struct socket *so, sctp_assoc_t assoc_id) 82 { 83 struct sctp_inpcb *inp, *n_inp; 84 struct sctp_tcb *stcb; 85 uint32_t state; 86 87 inp = (struct sctp_inpcb *)head->so_pcb; 88 if (inp == NULL) { 89 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 90 return (EFAULT); 91 } 92 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 93 if (stcb == NULL) { 94 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 95 return (ENOTCONN); 96 } 97 state = SCTP_GET_STATE((&stcb->asoc)); 98 if ((state == SCTP_STATE_EMPTY) || 99 (state == SCTP_STATE_INUSE) || 100 (state == SCTP_STATE_COOKIE_WAIT) || 101 (state == SCTP_STATE_COOKIE_ECHOED)) { 102 SCTP_TCB_UNLOCK(stcb); 103 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 104 return (ENOTCONN); 105 } 106 n_inp = (struct sctp_inpcb *)so->so_pcb; 107 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE | 108 SCTP_PCB_FLAGS_CONNECTED | 109 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */ 110 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags)); 111 n_inp->sctp_socket = so; 112 n_inp->sctp_features = inp->sctp_features; 113 n_inp->sctp_mobility_features = inp->sctp_mobility_features; 114 n_inp->sctp_frag_point = inp->sctp_frag_point; 115 n_inp->partial_delivery_point = inp->partial_delivery_point; 116 n_inp->sctp_context = inp->sctp_context; 117 n_inp->inp_starting_point_for_iterator = NULL; 118 /* copy in the authentication parameters from the original endpoint */ 119 if (n_inp->sctp_ep.local_hmacs) 120 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs); 121 n_inp->sctp_ep.local_hmacs = 122 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs); 123 if (n_inp->sctp_ep.local_auth_chunks) 124 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks); 125 n_inp->sctp_ep.local_auth_chunks = 126 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks); 127 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys, 128 &n_inp->sctp_ep.shared_keys); 129 /* 130 * Now we must move it from one hash table to another and get the 131 * stcb in the right place. 132 */ 133 sctp_move_pcb_and_assoc(inp, n_inp, stcb); 134 atomic_add_int(&stcb->asoc.refcnt, 1); 135 SCTP_TCB_UNLOCK(stcb); 136 137 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT); 138 atomic_subtract_int(&stcb->asoc.refcnt, 1); 139 140 return (0); 141 } 142 143 144 struct socket * 145 sctp_get_peeloff(struct socket *head, sctp_assoc_t assoc_id, int *error) 146 { 147 struct socket *newso; 148 struct sctp_inpcb *inp, *n_inp; 149 struct sctp_tcb *stcb; 150 151 SCTPDBG(SCTP_DEBUG_PEEL1, "SCTP peel-off called\n"); 152 inp = (struct sctp_inpcb *)head->so_pcb; 153 if (inp == NULL) { 154 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, EFAULT); 155 *error = EFAULT; 156 return (NULL); 157 } 158 stcb = sctp_findassociation_ep_asocid(inp, assoc_id, 1); 159 if (stcb == NULL) { 160 SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTP_PEELOFF, ENOTCONN); 161 *error = ENOTCONN; 162 return (NULL); 163 } 164 atomic_add_int(&stcb->asoc.refcnt, 1); 165 SCTP_TCB_UNLOCK(stcb); 166 newso = sonewconn(head, SS_ISCONNECTED 167 ); 168 if (newso == NULL) { 169 SCTPDBG(SCTP_DEBUG_PEEL1, "sctp_peeloff:sonewconn failed\n"); 170 SCTP_LTRACE_ERR_RET(NULL, stcb, NULL, SCTP_FROM_SCTP_PEELOFF, ENOMEM); 171 *error = ENOMEM; 172 atomic_subtract_int(&stcb->asoc.refcnt, 1); 173 return (NULL); 174 175 } 176 SCTP_TCB_LOCK(stcb); 177 atomic_subtract_int(&stcb->asoc.refcnt, 1); 178 n_inp = (struct sctp_inpcb *)newso->so_pcb; 179 SOCK_LOCK(head); 180 n_inp->sctp_flags = (SCTP_PCB_FLAGS_UDPTYPE | 181 SCTP_PCB_FLAGS_CONNECTED | 182 SCTP_PCB_FLAGS_IN_TCPPOOL | /* Turn on Blocking IO */ 183 (SCTP_PCB_COPY_FLAGS & inp->sctp_flags)); 184 n_inp->sctp_features = inp->sctp_features; 185 n_inp->sctp_frag_point = inp->sctp_frag_point; 186 n_inp->partial_delivery_point = inp->partial_delivery_point; 187 n_inp->sctp_context = inp->sctp_context; 188 n_inp->inp_starting_point_for_iterator = NULL; 189 190 /* copy in the authentication parameters from the original endpoint */ 191 if (n_inp->sctp_ep.local_hmacs) 192 sctp_free_hmaclist(n_inp->sctp_ep.local_hmacs); 193 n_inp->sctp_ep.local_hmacs = 194 sctp_copy_hmaclist(inp->sctp_ep.local_hmacs); 195 if (n_inp->sctp_ep.local_auth_chunks) 196 sctp_free_chunklist(n_inp->sctp_ep.local_auth_chunks); 197 n_inp->sctp_ep.local_auth_chunks = 198 sctp_copy_chunklist(inp->sctp_ep.local_auth_chunks); 199 (void)sctp_copy_skeylist(&inp->sctp_ep.shared_keys, 200 &n_inp->sctp_ep.shared_keys); 201 202 n_inp->sctp_socket = newso; 203 if (sctp_is_feature_on(inp, SCTP_PCB_FLAGS_AUTOCLOSE)) { 204 sctp_feature_off(n_inp, SCTP_PCB_FLAGS_AUTOCLOSE); 205 n_inp->sctp_ep.auto_close_time = 0; 206 sctp_timer_stop(SCTP_TIMER_TYPE_AUTOCLOSE, n_inp, stcb, NULL, 207 SCTP_FROM_SCTP_PEELOFF + SCTP_LOC_1); 208 } 209 /* Turn off any non-blocking semantic. */ 210 SCTP_CLEAR_SO_NBIO(newso); 211 newso->so_state |= SS_ISCONNECTED; 212 /* We remove it right away */ 213 214 #ifdef SCTP_LOCK_LOGGING 215 if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) { 216 sctp_log_lock(inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_SOCK); 217 } 218 #endif 219 TAILQ_REMOVE(&head->so_comp, newso, so_list); 220 head->so_qlen--; 221 SOCK_UNLOCK(head); 222 /* 223 * Now we must move it from one hash table to another and get the 224 * stcb in the right place. 225 */ 226 sctp_move_pcb_and_assoc(inp, n_inp, stcb); 227 atomic_add_int(&stcb->asoc.refcnt, 1); 228 SCTP_TCB_UNLOCK(stcb); 229 /* 230 * And now the final hack. We move data in the pending side i.e. 231 * head to the new socket buffer. Let the GRUBBING begin :-0 232 */ 233 sctp_pull_off_control_to_new_inp(inp, n_inp, stcb, SBL_WAIT); 234 atomic_subtract_int(&stcb->asoc.refcnt, 1); 235 return (newso); 236 } 237